- The Musical Alternate Universe Hypothesis: The musical is set in an alternate world, or magic has been worked on the ordinary world, in which people really do burst into spontaneous song and dance. If the world has always been this way, singing is simply a normal and commonplace form of human communication in this universe; if the world is not normally this way, expect it to be some sort of an uncontrollable compulsion to sing at emotional moments, perhaps induced by the actions of The Music Meister. In this interpretation, since the singing is an in-universe phenomenon, the characters are aware of the songs and may explicitly comment on their musical style or specific lyrics; there may be characters who don't like singing and refuse to participate or try to stop others from starting to sing when the music begins to swell; or characters may say things in song that they wouldn't otherwise or regard statements that are sung differently from spoken statements. This is most common in comedic works or as a one-off occurrence in a normally non-musical world, since it draws attention to the weirdess of the concept. In particular, almost all parodies of musicals treat them as being Alternate Universe, even when the musical being parodied is not.
- The All In Their Heads Hypothesis: There is no singing; the songs are an artistic rendering of the characters' fantasies, with the format of song in a way serving to distinguish between what really happens and what is only in the characters' heads, much like a Shakespearean Soliloquy. Naturally, this means that no characters are aware of what goes on in another character's song: there may be duets, but then they are Distant Counterpoint Duets where the two characters do not know of one another's participation. This makes the musical more palatable for some, since there is obviously no literal singing involved in-universe.
- The Diegetic Hypothesis: The characters are performing actual, literal songs for one another as they might in Real Life, with the songs having been written and practiced beforehand in a realistic way. This can overlap with Alternate Universe if writing and performing a song is treated as analogous to writing and giving a speech. Fully diegetic musicals are distinguished from non-musicals that happen to feature musical performances only by the number of such musical performances that are given the viewer's full attention.
- The Adaptation Hypothesis: Derives from the Literary Agent Hypothesis: the songs are merely a dramatic reconstruction of what really happened. For instance, if two characters converse in song and come to some sort of conclusion, it is assumed that the characters really just had a normal, non-musical conversation that came to the same conclusion, but because it's a musical, it has here been adapted into a song for drama (or comedy) purposes. This is the most common interpretation in stage musicals, and the way most of them are written: almost All Musicals Are Adaptations, after all, and the source material generally doesn't have any singing. Many musical songs only make sense in light of this interpretation: they may be essentially montages of a much longer time period, for instance, while still featuring dialogue or interactions between the characters that rules out the song being a fantasy.
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Anime and Manga
- The ballet in Princess Tutu is clearly diegetic (except in Dream Sequences, of course). The advanced ballet students show off dances that they've presumably been rehearsing or might have performed in the past, and the bad dancers dance poorly unless they have good partners (in which case they still dance poorly, but at least they look good doing it). Tutu and Kraehe presumably know every dance ever due to their magicalness.
- Senki Zesshou Symphogear is a mix; The music academy and idol performances add diegetic elements, while the symphogear armors invoke the alternate universe version to power themselves.
- In Marvel Adventures when Johnny Storm is traveling through multiple alternate realities he comes upon Doctor Doom confronting the Fantastic Four with a song about their doom, making it a musical number in an Alternate Universe from the perspective of the characters.
- Scott Pilgrim is a strange case. The comics have it as a straight AU example, and is the least weird thing about the universe (which includes universities in the sky, glowing heads, power-ups, 1-ups, magical/vegan powers). The film, on the other hand, treats Matthew Patel bursting into song as very strange even for the universe (as evidenced by Stacey's "what the fuck?" expression)
- The League of Extraordinary Gentlemen takes place in a universe where every work of fiction is true (poems and musicals being no exception), so this naturally comes up at one point. In one section of "The New Travelers' Almanac" in the second volume, we learn that the events of Lewis Carroll's poem The Hunting of the Snark were just a hallucination that unfolded in the mind of one Dr. Eric Bellman, a psychiatrist who went insane after trying to lead an expedition into Wonderland. The dialogue in that poem is said to be in verse because Bellman's deteriorating mental state left him incapable of speaking in coherent prose.
- In the Century trilogy, however, it's shown that in this world people really do, occasionally, just break into song and everybody treats it like it's normal. It happens several times in 1910, thanks to being a partial adaptation of the Threepenny Opera. In 2009 Alan tries to start a duet with Mina but she's not in the mood. 1969 also has plenty of singing, but it doesn't really count as all of it takes place during rock concerts.
- One issue of the Nodwick print comic runs on Alternate Universe (magic influence subtype) rules when Yeagar asks Artax for some magical help to make him more eloquent. Turns out the scroll Artax used made everyone burst into song and dance around Yeagar at the drop of a hat, instead. (Mostly rock and pop parodies from the '80s and early '90s.)
- In Candy For Your Thoughts, a fanfic of Total Drama World Tour (see below), a fan actually contacts the cast during the Aftermath episode and accuses the whole show of being scripted.
Fan: And how is it possible that you guys can sing the exact same song, at the exact same time, in perfect unison without any kind of rehearsal or script involved...and WHEN YOU ARE IN DIFFERENT PLACES AS WELL? IT'S IMPOSSIBLE!Fan: What the hell kind of answer is that? This show is so fu...
- In Change Of Plans, another Total Drama World Tour fanfic, the parts that seem Adaptational are explained as either being CGI or Chris forcing the characters to re-sing parts of the song in different settings.
Films — Animation
- The Nightmare Before Christmas could be either Alternate Universe or Adaptation for most of the movie; it could plausibly be normal for the people of the holiday towns to express themselves by singing (at no point does anyone from the human world sing) but no one ever comments on it. Exceptions:
- "This Is Halloween" is pretty clearly Diegetic, since the citizens of Halloweentown plan a big event every Halloween, and the way the Mayor walks up to Jack's doorstep humming the tune the next day points toward the characters at least knowing the song in-universe.
- "What's This?" fits as All In Their Heads, because even though Jack's running around singing and making a spectacle of himself, the only time anyone even comes close to noticing him is when he passes within a hair's breadth of them.
- "Poor Jack" could be whatever of the three. Diegetically speaking, he starts singing after having heard the street musicians playing their tune, so he might be improvising on this melody he's heard many times before and seems to fit so well his mood. The song seems to start as an Inner Monologue All In Jack's Head, but Sally is supposed to be witnessing the song, and the key to her deeper understanding of Jack's character is having heard the lyrics, so he must be speaking out loud. He might, however, be just speaking, not singing.
- "Sally's Song" is similar, she does walk past the same street musicians and said musicians seem to produce the background music for her song.
- "Oogie Boogie's Song" can either be diegetic or Alternate Universe, since it isn't clarified if the background music is produced by one of the casino machines in Oogie's lair, in which case he's improvising the lyrics on a preexisting tune (that's pretty much diegetic), or if he's singing that like if he was talking.
- For My Little Pony Equestria Girls:
- My Little Pony: Equestria Girls is almost completely All In Their Head - almost all the songs are sung offscreen during a montage, given to the thought the characters are singing in their head. The only song that averts this is the cafeteria song, which is somewhat diegetic.
- My Little Pony: Equestria Girls – Rainbow Rocks is a diegetic type work — all of the songs (about 8 total, excluding the opening theme) are shown to be performed by the characters within the context of the film's plot, though several cut away to various scenes, or during a song emphasizing the Battle of the Bands theme, to literal battling between bands on the high points of the song.
- My Little Pony: Equestria Girls – Friendship Games is a mixture; Human Twilight's "I Want" Song and Cinch's villain song are the Diagetic type; "ACADECA" is generally All In Their Head, with a hint of Alternate Universe and Adaption.
- The Book of Life is diegetic. Almost all of the songs are performed by the characters themselves, practiced and performed in real time, rather than just being random asides like in (say) Disney movies.
- Most Disney Animated Canon is Alternate Universe.
- In The Sword in the Stone, for example, most of the singing done by characters with magical powers, and it's easy to imagine them casting spells using music.
- The Great Mouse Detective is pretty much Diegetic. There are three songs in the film (not including the reprise of "Goodbye So Soon" sung over the end credits) and they all occur within the film's story. One is "The World's Greatest Criminal Mind". The other two songs are a stage show ("Let Me Be Good to You") and a song Ratigan composed as a farewell to Basil, which is played on a phonograph ("Goodbye So Soon").
- The first, "The World's Greatest Criminal Mind," is the Villain Song. It is a bit harder to determine. One thing is sure, it is not an Inner Monologue or the character speaking instead of singing: he mentions being singing, accompanies himself with a harp at one point, and the song is even interrupted and then resumes with Professor Ratigan telling his chorus of Mooks "And now, as you were singing..." It could still be diegetic: the song itself - a rather elaborate, off-the-cuff number - works within the context of the story because Professor Ratigan is just the sort of egotistical weirdo who would randomly stage a Broadway-style song and dance routine about how awesome he is. However, the books seem to answer to him in song as a natural thing, even though it's clear they couldn't possibly practiced. And the harp mentioned earlier is also the only instrument seen at all; the orchestral background music's origin remains unknown.
- Pocahontas falls right under the 'Adaptation' label. "Colors of the Wind" notably is a representation of Pocahontas showing John Smith how great nature is, "Mine Mine Mine" is the settlers digging for gold and "If I Never Knew You" is really a conversation between John and Pocahontas.
- Tangled introduces a twist during "I've Got A Dream": In this Alternate Universe, some people choose not to burst into song due to cynicism, grumpiness, or plain ol' bad mood. Flynn is perfectly capable of joining the Crowd Song, but is unwilling to do so until he is forced at swordpoint! In fact, his spontaneous duet with Rapunzel during "I See The Light" is indicative of his character development and shift towards more idealistic values.
- Frozen, for the most part, falls into the Adaptation format. Anna clearly did spend many years asking Elsa to come out and play during "Do You Want to Build a Snowman" and did argue with her about returning to Arendelle and the eternal winter she'd caused in the reprise of "For the First Time in Forever", even if there was no actual occurrence of singing in either case. Anna's duet with Hans, "Love Is An Open Door", probably would be this too, since the song involved Hans charming Anna into falling for him and presumably in actuality was done without singing. For "Fixer Upper," the trolls clearly prepared Anna and Kristoff for a wedding, and "In Summer" may really be Olaf simply discussing his fantasy for summer. "Let It Go" is probably All in Elsa's Head, since Elsa is all by herself at the time of the song, meaning that it's probably an inner monologue. The original "For the First Time in Forever" could be All In Their Heads as well: none of the servants take notice of Anna moving some of the salad plates, nor does anyone pay any attention to Anna singing as she travels down the railing of the bridge to the castle against the arriving guests. For Elsa's solo in that song, it could be argued that all of her lines, except for "Tell the guards to open up the gates!" are an internal monologue instead.
- "Reindeer(s) Are Better than People", however, is clearly diegetic, as Anna explicitly comments on the song after it is done and the way it is presented implies that Kristoff sings this every night. Meanwhile, it's unknown how "Frozen Heart" fits, but it most likely fits as diegetic, as the singers are clearly sawing to the beat of the music and, as demonstrated by Snow White and the Seven Dwarfs, it's perfectly normal to sing while working.
- Moana acts as an Alternate Universe, but calls attention to this nature. "How Far I'll Go" passes without comment, but Maui continues humming "You're Welcome" to himself even after the song is over, and "Shiny" is explicitly done "in song form" with Tamatoa asking the heroes if they liked it afterward. Maui also comments at one point that if Moana breaks into song, he's going to throw up. "We Know The Way", on the other hand, may be All in Moana's Head as she's given a spirit vision of her ancestors; but then again, it's a Musical Universe so her ancestors might well have actually sung that. Likewise, "Where You Are" is a montage song, making this song the only one that fits the Adaptation format.
- All Dogs Go to Heaven seems to fall under Alternate Universe Hypothesis. Musical numbers aren't questioned all that often and occur in all versions. However, there are some more wild numbers, but one is the Trope Namer for Big-Lipped Alligator Moment and most of the others involve a legit Reality Warper being the one singing.
- A Goofy Movie is a mix of Diegetic and Adaptation. For the diegetic part, "Stand Out" and "I2I" are In-Universe pop songs, while "Lester's Possum Park" occurs during a show. "After Today," "On the Open Road," and "Nobody Else But You" happen with no explanation and may very well be mere representations of the singers' feelings and thoughts, but since Goofy starts to sing "On the Open Road" after noticing a rhythmic beat made by his car, "On the Open Road" may count as diegetic/Alternate Universe.
- Coco is Diegetic; all of the songs are performed as part of an act or for an audience.
Films — Live-Action
- Muppet Treasure Island is a mixture, but mostly Alternate Universe combined with a removable fourth wall. It's usually acknowledged that they're singing ("Sailing for Adventure" features Samuel Arrow cautioning them not to get sloppy just because they're singing) but no one seems to find anything strange about it.
- "Professional Pirate" is Diegetic, since Long John Silver tells his men to "show 'em you've been practicing".
- "Cabin Fever" seems to be All In Their Heads, but only because the crew's been driven temporarily insane. Or was it? Maybe the insanity is what got them all singing about it? The question is never answered.
- After "Cabin Fever," Clueless actually asks Polly the Lobster, "What was that song that just happened?" Polly thinks he's crazy, indicating Polly wasn't aware of the song. This indicates that it was All In Their Heads for the singers, but also for Clueless even though he wasn't singing.
- The Muppets is mostly Alternate Universe (The reprise of "Life's a Happy Song" ends with the crowd collapsing from exhaustion; the muppets are baffled by Tex Richman's rap), while the songs performed during the fundraiser are diegetic (just as they would be in Real Life).
- Walk the Line is Diegetic, as Johnny Cash is a professional singer on tour with his group. Each musical number depicted in the film occurs at a point that is professionally or personally important to Johnny Cash' life. (For example, his first audition, his first public performance, his comeback performance, asking June to marry him on stage, etc.)
- The film version of Chicago falls under All In Their Heads. Except for those numbers actually performed on stage, all the songs are the product of Roxie Hart's imagination, to the point where the song "Class" was removed because there was no way the director could make it fit.
- 9 is done by the same director, and does the same thing. Since it's an adaptation of 8 1/2, this works pretty well. The protagonist is having a mid-life crisis and is a creative film director.
- Enchanted is definitely of the Alternate Universe type. Giselle is from another universe and sometimes has the ability to make our universe act according to her universe's rules. When everyone starts singing in Central Park, Robert wonders where they learned the song.
- The Wedding Singer is of the Diegetic type. Most of the songs are performed by Robbie in his professional capacity. The only other one is when he is trying to win back Julia; many people in Real Life sing when courting a woman.
- Many people refuse to count O Brother, Where Art Thou? as a musical because the songs don't come out of nowhere, but it would fit pretty easily as a diegetic musical.
- The Blues Brothers is mostly diegetic, with actual bands and musicians doing rehearsed performances. But then you have Aretha Franklin randomly bursting into song in a diner accompanied by background singers, and people flooding the streets to do a choreographed dance when Ray Charles belts out a number. "Minnie the Moocher" is an odd case where the music is clearly diegetic (they just happened to know how to play that exact song perfect the first time), but the outfits worn by the band are clearly part of an Alternate Universe: they instantly change from their regular clothes to white vests when the song starts and suddenly reverted when it ends between shots, without any scene change whatsoever.
- Once is pretty clearly a Diegetic musical, as the characters are both musicians performing songs for each other and recording an album together, but many of the songs have lyrics relevant to the plot.
- Dreamgirls dabbles in all four of these categories, but sticking mostly to Alternate Universe and Diegetic. The film seemed to be purely Diegetic for the first hour or so, then suddenly began to dabble in the other categories with no warning or explanation.
- Moulin Rouge! is primarily an alternate universe, with a setting that lends itself well to diegetic numbers. Also the story is being typed up by Christian, overlapping with the 'All In Their Head' somewhat.
- Little Shop of Horrors the film is definitely an Alternate Universe, but songs like "Skid Row" and "Suppertime" could be All in Their Heads or an Adaptation based on the telling of the Greek Chorus composed of three Motown songstresses. Audrey II's lyrics could be the Diegetic compositions of a very musical alien. Oh, and "If you two could stop singing for just one minute..."
- Fame (1980) is mostly diegetic, as is appropriate for a film about a school for the performing arts, but one number, Hot Lunch, seems to spill into Alternate Universe territory. An impromptu bit of music by a few students in the cafeteria gradually enlarges to encompass the entire school, spilling out into the surrounding city streets until it literally stops traffic. Somewhat justified, perhaps, in that it is a school for the performing arts, whose student body might be better prepared for sudden improv than your average high school.
- Pennies from Heaven (1978 TV miniseries and 1981 Film) -the many lip-synced musical numbers are all in the heads of the main characters.
- Monty Python and the Holy Grail is mostly diegetic. The minstrel and his band are clearly singing in-universe about Brave Sir Robin. The Knights of the Round Table song may appear to be something else, but as part of the song is about how they like to dress up, sing and dance, it's clear that the knights actually are singing and dancing. Which is why Arthur decides not to go to Camelot, as it is "a silly place." The Swamp Castle scenes are probably Alternate Universe, since music will start out of nowhere when Prince Herbert wants to sing, but stops when the King tells it to.
- The Mask is an alternate universe example. A little magic from the title character can make people break out in Spontaneous Song And Dance. In fact, people struggle to maintain control as they're slowly forced to sing.
- The short film 7:35 in the Morning is a diegetic example, and arguably a deconstruction. A woman stopping at a diner is surprised when everyone starts singing to her. As it turns out, a single person wrote the whole song in an attempt to woo her... and he's threatening to blow up the diner if anyone doesn't sing along.
- The film version of Cabaret is diegetic. All the songs take place in a night club, with the single exception of "Tomorrow Belongs To Me", a patriotic song that a boy sings to a luncheon, with the diners joining in for the last chorus.
- In Dancer in the Dark, all the musical numbers are explicitly depicted as daydreams of the main character, who as it happens loves movie musicals.
- Across the Universe combines most if not all of these types, sometimes switching from one to another mid-song; for example, "I Am the Walrus" starts out diagetic, with Bono singing a song for his party guests, and then quickly dissolves into All In Their Heads as the hallucinogens kick in...
- Santa and the Ice Cream Bunny is most likely diegetic (though the producers likely didn't give it much thought). All the musical numbers except for one have no background accompaniment, and the singing sounds exactly the way it would in real life.
- Labyrinth is primarily Alternate Universe ("As the World Falls Down" is partially All In Their Heads). All the song-and-dance numbers take place in the Magical Land the heroine is swept into, and unlike most musicals, aren't spread out among the primary characters. A Wacky Wayside Tribe gets one and the primary villain gets the other three, suggesting that singing is simply a way they express themselves.
- Singin' in the Rain, being a movie about making a movie musical, is a mixture of Diegetic ("Fit as a Fiddle", "All I Do Is Dream of You", "Beautiful Girl", "Would You?") and Alternate Universe ("Make 'Em Laugh", You Were Meant For Me", "Moses Supposes", "Good Morning'", "Lucky Star"). "Broadway Melody Ballet" is a hybrid of All In Their Heads and Diegetic, as it occurs in a scene where Don and Cosmo are describing a proposed musical number to their studio head. The title song itself plays out as Alternate Universe, but since it actually originated from a movie musical called "The Hollywood Revue of 1929", it could be regarded as Diegetic if one presumes that said musical exists in-universe and had been seen by the characters.
- The 2005 adaptation of Charlie and the Chocolate Factory is purely Diegetic, with the first song sung by Wonka's automatons and the rest sung by Oompa-Loompas. This trope is actually discussed in the movie, and Wonka claims that the Oompa-Loompas' songs are improvised on the spot... except they clearly aren't. Naturally, this led to fan theories that they rehearsed the songs beforehand and Wonka specifically picked the route that would make the spoiled children's presumed flaws manifest.
- Pitch Perfect is firmly Diegetic. The Bellas are shown practice their choreography and harmonizing. When Beca sings another song during Semi Finals, Aubrey calls her out for breaking from routine. During the Riff-Off, some songs seem to practiced or familiar, while some of the songs are done by the singers as improv.
- Repo! The Genetic Opera has almost no spoken dialogue, being an opera (or a rock opera, at least). Most of the movie is Alternate Universe, but it gets a little mixed up when they actually get to the Genetic Opera. While Mag and Amber's songs are clearly meant to be Diegetic, "We Started This Op'ra Shit" is a mix (most of the song is meant to be a rehearsed performance, but the single mom's testiominal isn't) and they switch back to Alternate Universe after the Genetic Opera ends (even though the characters are still onstage). "Seventeen" is partly All In Their Heads; while it involves an argument between Shilo and her dad, Shilo also sings it directly into a microphone with a backing band that includes Joan Jett! And Grave Robber is a special case altogether, since half of his songs are exposition sung directly to the audience.
- Reefer Madness: The Musical (not the early '30s Scare 'em Straight film), certainly is "All in their heads." The opening song shows the parents beginning to panic over the thought of their children becoming monsters for smoking marijuana. Then their kids become literal ghouls and mob the parents, complete with dance choreography from Michael Jackson's Thriller. At the end of the song, the ghouls vanish and the parents are firmly in the hands of an anti-pot activist. The silliness only goes up from there.
- Scott Pilgrim vs. The World is not a musical, but quite a few musical numbers come up and are important to the plot. They are always both diegetic and in an Alternate Universe where the world follows video-game and comic-book like rules. For example, one set of performers tears the roof off the building, meaning they stun the crowd -and- tear the roof clean off the building.
- Darling Lili is diegetic. Most of the musical numbers are performances by Lili or other characters. There's also a song (which doesn't appear in the Director's Cut) sung by a group of French schoolchildren whom Lili and Bill follow for a while during their romantic weekend in the country.
- Teen Beach Movie, or rather Wet Side Story, is an Alternate Universe variety that the protagonists Mack and Brady are trapped in, and seems to force musical numbers on visitors.
- Save for two songs that are diegetic (both versions of In The Flesh, where Pink is seen singing in front of an audience), the film version of The Wall is purely adaptational, as is suggested by the opening song, where Pink tells the audience that to see his true self, they have to claw their way through his disguise. Also, several songs, such as "Comfortably Numb" only work in an adaptational sense (in the case of "Comfortably Numb", though singing, Pink admits he can't hear what the doctor is saying, yet he seems to respond to him as if he can), though others, like "The Trial", work best in an all in his head form.
- The High School Musical movies seem to be alternate universe. At least one Tumblr user pointed out the logic of one character doing an entire dance number about how he doesn't dance, and another character not wanting his friends to know he likes singing so he breaks into song during their basketball practice.
- Cover Girl is mostly Diegetic, with a couple of exceptions: "Make Way for Tomorrow" is Alternate Universe, and the "Alter Ego" dance is All In Danny's Head. "Long Ago and Far Away" is ambiguous—it could be Diegetic (improvised to Genius's piano playing), or it could be Alternate Universe.
- In contrast to the stage show, Into the Woods has the whole film being narrated by the Baker to his baby son, making this the All In Their Heads hypothesis. Many of the songs could be just the Baker's imagination of what really happened. But then again, it is a fairy tale world and some of the songs feature things the Baker shouldn't know about (unless some of the other characters filled him in later) - so both 'Alternate Universe' and 'Adaptation' are applicable.
- The Flight of the Conchords TV show is about musicians, and thus a lot of the songs are diegetic (e.g. Bret, You've Got It Going On, If You're Into It and Albi the Racist Dragon, the last being on a Show Within a Show). However, other songs are All In Their Heads (e.g. She's So Hot, Boom, which stylistically shows the girl it is sung to during it but is still obviously not actually being performed for her, Business Time, Mermaids, Sugarlumps), and others are clearly Adaptation Hypothesis examples (e.g. Most Beautiful Girl in the Room, Hurt Feelings, I Told You I was Freekie).
- In the Flight of the Conchords song Hiphopopotamus vs. Rhymenoceros (feat. the Hiphopopotamus and the Rhymenoceros), which is All in Their Heads, one of the muggers asks if they 'were dancing a little bit just then'. They say no, sheepishly.
- Deconstructed in the Musical Episode of Scrubs, "My Musical," as the singing was a hallucination of a patient who had a stroke, and in fact her life was in danger. When she is cured, it stops, but the episode ends with her humming to herself as she misses the music inside her head. So All In One Character's Head, mixed with the spirit of the Adaptation Hypothesis (characters singing to each other are really having those conversations, but not really singing).
- This also causes a bit of Fridge Brilliance to kick in, since the patient isn't around for any of the actual dialogue sequences, and as soon as she does appear, characters break into song, even if they're halfway through a conversation.
- The Buffy Musical Episode is an example of the "magic spell" subset of the Alternate Universe Hypothesis. Everyone in Sunnydale starts singing and dancing uncontrollably, as if they're in a musical. They know it's weird, but they can't stop. The culprit turns out to be Sweet, a demon that Xander accidentally summoned. It makes people sing about their hidden feelings, causing various relationship problems, and in some extreme cases the people with the biggest secrets dance until they literally burn up.
Giles: I've got a theory, that it's a demon. A dancing demon! No, something isn't right thereWillow: I've got a theory, some kid is dreaming, and we're all stuck inside his wacky broadway nightmare!Xander: I've got a theory we should work this outAll: It's getting eerie... What's this cheery singing all about?— Once More With Feeling, the Buffy the Vampire Slayer Musical episode (from Season 6)
- Norm Macdonald Lampshaded this a couple of times on SNL, once in "Evita" and once in a "West Side Story" Expy.
Eva Peron: Don't cry for me, Argentina,
Juan Peron: What the hell was that?
- The truth is I never left you
All through my wild days
My mad existence
I kept my promise
Don't keep your distance.
Eva Peron: What was what?
Juan Peron: You were singing.
Eva Peron: Oh.. I, I, I did, didn't I?
Juan Peron: Yeah, yeah, don't do that!
- One of Alex Borstein's characters on MADtv was a redhead named Annie whose spontaneous musical outbursts were stated to be a stress-triggered mental illness.
- Glee seems to primarily be diegetic, but mixes in a decent sprinkle of "All in Their Heads", numbers. Also, it doesn't do to think too hard about the quality of some of the first read-throughs from a purely diegetic perspective.
- Even Stevens' "Influenza: The Musical" is a combination of Alternate Universe and All In Their Head. Specifically, Ren's.
- That's So Raven had a diegetic musical episode, wherein all the wacky antics are supposed to wow a talent scout disguised as a janitor.
- Pennies from Heaven (1978 TV miniseries and 1981 Film) -the many lip-synced musical numbers are all in the heads of the man characters.
- Dennis Potter LOVED this trope - also seen in Lipstick On Your Collar, used in exactly the same way as in Pennies.
- The musical episode of Sanctuary is an interesting variation. Abby is singing (without realizing it) to other characters because she's been infected with a parasite that interferes with processing and producing normal speech. Everyone else sings to Abby out of necessity since she can't understand them otherwise. The songs are not rehearsed and are basically just sung dialogue.
- One Saturday Night Live skit, Zac Efron plays his signature character, the star of the High School Musical series, giving a speech to his former classmates after he'd spent a year at college. He crushes their illusions (and lack of Medium Awareness) by explaining that the music seems to stop after graduation, and spontaneous singing just gets you funny looks. (So it's the alternate universe interpretation combined with Like Reality Unless Noted.)
"And from what I can tell, this is America’s only singing high school! I was as shocked as you are."
- Doctor Who:
- The Musical Episode "The Gunfighters" mostly has a variant of All In Their Heads, as the songs act as a Greek Chorus, communicating on the action without actually engaging in it. However, there is a big diegetic musical number when Steven and Dodo, and later Steven and Doc Holiday's girlfriend, are forced by a bunch of gangsters to sing in order to prove that they really are a group of travelling singers and therefore aren't in league with Doc Holiday.
- The audio drama "Dr Who and the Pirates" is a weird blend of all of these. The story is presented as a tale that Evelyn is telling someone else, but when the Doctor cuts in he decides to improve it by making it into a musical, with him singing (and Evelyn being very embarrassed by this) - an in-universe Adaptation. Yet the songs we hear in the story are presumably being performed by the Doctor in the 'real world' - Diagetic - though without the backing music or singers we hear - which are All In His Head. Also, within the world of the story itself, just bursting into song is considered normal by the minor pirate characters - Alternate Universe.
- The first half of Mad Men's last season ends with Bert Cooper performing "The Best Things in Life Are Free" for Don with several unknown women. Considering all the performers disappeared the second it ended, no one reacted to it except Don, and Cooper had just died earlier than day, this falls pretty clearly in "All In Their Head".
- Crazy Ex-Girlfriend can vary from song to song, but the number of quickly reversed changes in setting and costume, the out-of-nowhere backup dancers, and the switches to animation and back point to "All In Their Heads."
- The Flash (2014)/Supergirl Musical Episode "Duet" is a Musical Universe via outside influence, as the heroes are trapped in a musical dream world. But since the dream is set in a 40s/50s night club, this allows some songs to be Diagetic as well. The final song, "Running Back to You", is %100 Diagetic, as it takes place after escaping the dream world and Barry is inspired by the ordeal to prep a song to sing to Iris.
- Galavant is blatantly an Alternate Universe example, and characters frequently complain about their songs, comment on their singing skills, get exasperated with other people hogging the tune, and react to the lyrics as they are sung (to the point where The Mole accidentally let slip about her true allegiance and had to quickly cover it up mid-song when the others took notice). At the end of the second season, the Final Battle was even postponed while the Jester stood between the two armies to sing the audience a recap song!
- RENT is mostly Adaptation with some All In Their Heads (e.g. Without You and What You Own). There are a few diegetic numbers, though, such as Your Eyes and Over The Moon, and more that ambiguously might be diegetic, e.g. Today 4 U (which may or may not be a literal performance by Angel). Notably, the character of Roger is a musician who spends most of the musical struggling to write a song, even as he sings many songs - this baffles some viewers who are unfamiliar with the silent assumption of the Adaptation Hypothesis that the songs aren't literally happening.
- Sweeney Todd: The Demon Barber of Fleet Street is largely Adaptation with some All In Their Heads (e.g. Sweeney's portion of Johanna (Reprise), part of Epiphany) and a couple of seemingly diegetic (Toby's 'advertising jingles' first for Pirelli and then Mrs. Lovett's pie shop and the "Parlor Songs" sequence).
- The Producers seems to use every version of this in theirs. They are trying to produce a musical so some of the numbers are deliberately rehearsed, others take place in the real world but don't seem to be acknowledged as such, in fact, some of these have to be Adaptation Hypothesis because its only in a later "real world" number that Bialystock notices his co-producer's singing voice.
- Mamma Mia! combines Alternate Universe with Diegetic, as several of the songs are either Donna and her friends reprising their old hits, or Donna's friends reprising their old standards to cheer her up.
- Hairspray is a mixture of Alternate Universe and Diegetic, with one or two songs that might possibly be All In Her Head.
- Hedwig and the Angry Inch is a rare example of a Diegetic stage musical.
- The movie adaptation, however, mixes in some "All In Their Heads" numbers - "Wig in a Box" is a flashback to an epiphany conveyed as a musical number, and the final four numbers ("Hedwig's Lament," "Exquisite Corpse," "Wicked Little Town" reprise, and especially "Midnight Radio") are presented in a Mind Screw that could be any combination of Diegetic, All In Their Heads, or Adaptation.
- The stage version of Cabaret includes a lot of diegetic songs, performances at the Kit Kat Klub, but also a high percentage of songs like "So What" or "It Couldn't Please Me More", which fall under the Alternate Universe distinction.
- Despite being set during the casting of a Broadway musical (and thus perfect fodder for the Diegetic), most of the singing in A Chorus Line are either Alternate Universe or All In Their Heads.
- Spring Awakening is mostly All in Their Heads for solo numbers, though group songs seem to make use of the Adaptation Hypothesis.
- Fiddler on the Roof seems to have most of the categories. Tevye's monologues are clearly All In Their Heads, while his 'Do You Love Me' with Golde fits into Adaptation Hypothesis. Most of the other songs fit into Alternate Universe.
- Oliver! is mostly Alternate Universe, though the songs Nancy sings at the Three Cripples Inn ("It's a Fine Life" and "Oom Pah Pah") can fit into Diegetic.
- The songs the Hot Box Girls sing in Guys and Dolls are Diegetic, as is the Mission ensemble's 'Follow The Fold', but most of the other songs are either Alternate Universe or Adaptation Hypothesis.
- In 1776, every song John Adams sings with Abigail is All In Their Heads with a bit of Adaptation Hypothesis (as, in actuality, Abigail was back in Massachusetts and could only communicate with John by writing letters. So the instant two-way communication in those scenes only happens in John's mind). The other songs are either Alternate Universe or Adaptation Hypothesis.
- Actually, Adaption Hypothesis for the majority of it: 1776 uses as one of its major sources the writings of the people who were there at the time, to the point of reusing actual text with, at most, modernization of the English.
- Alternate Universe, however, is also valid given how smoothly Thomson inserts himself into the lyrics of "Cool, Cool, Considerate Men." Clearly, he's used to Congress doing this sort of thing.
- The Phantom of the Opera is approximately two-thirds Adaptation/All In Their Head and one-third Diegetic, with the "operas" and a few other examples like "Music of the Night" (which is basically the Phantom attempting to seduce Christine via Villain Love Song) happening as they would in real life but mostly with people singing what they would normally say or think to themselves. The film version supports supports the Adaptation Hypothesis by including scenes where characters actually speak the lyrics rather than sing them (although the result is awkward to say the least).
- As the main character in Top Hat is a musical star several songs are diegetic (such as "Top Hat, White Tie and Tails") as part of the various shows he was part of. "Dancing Cheek To Cheek" was an odd example that was simply the character singing lyrics to a song while they were ballroom dancing (two other songs are sung by other in-universe performers). The rest are all part of the Alternative Universe, a character did in fact get in trouble for tap dancing too loudly.
- Curtains is largely diegetic, with several songs being rehearsals for the Show Within a Show. Tough Act to Follow has enough dream sequence elements to be All in Their Heads for Cioffi and Nikki, and several other songs are a sort of Alternate Universe, since almost the entire cast is the cast of the Show Within a Show and are therefore ready to perform at the drop of a hat. Of particular note is The Woman's Dead, which Belling declares to be an acting exercise but is too well rehearsed to be such a thing.
- In Lady in the Dark, all the elaborate musical numbers take place during the Dream Sequences.
- Reefer Madness, as mentioned under film, is "All in their heads," though as less theater companies can afford to do the elaborate pieces that were done for the film, at times it may also be Adaptation. Consider Little Mary Sunshine - Showtime's version dives headlong into a theatrical version of a sex dungeon, while most theater companies simply have Mary engage in a little Double Standard: Rape, Female on Male.
- The Cat and the Fiddle handled its musical numbers mostly diegetically, with the principal characters being two rival composers and a street singer.
- Music in the Air tried to give all its songs a more or less diegetic introduction. This turned out awkwardly in some cases: "When The Spring Is In The Air," obviously written in character for The Ingenue Sieglinde, is first sung offstage by a strolling offstage, and "The Song Is You" becomes a backstage serenade that is acted nowhere near as sincerely as its lyrics.
- Word of God (in "The Story of HMS Pinafore") placed HMS Pinafore as a sort-of Alternate Universe in which people really do sing - there is a "standing rule that no one was ever to say anything to the Captain that could be sung", and the crew do their best to comply. http://diamond.boisestate.edu/gas/pinafore/book/chapter_4.html
- The musical version of Bullets Over Broadway seems to be a mix. A number of the songs, such as "Tiger Rag", "You Rascal You", "Lazy River", and David and Ellen's parts in "Ain't I Good To You", are clearly diegetic. "The Hot Dog Song" seems to be a mix of Diegetic and All In Their Head, with Olive genuinely singing the song to David and Marx while remembering how it was performed back in the day. Some other songs, such as the finale ("Yes, We Have No Bananas"), "Ain't I Good To You", and "Broken Heart For Every Light On Broadway" could just be characters singing songs they heard before while changing some lines to fit their situation-i.e. diegetic. A few songs seem to fall under All In Their Head ("Blues My Naughty Sweetie" seems to go completely unheard by David, and "The Panic Is On" is pretty clearly David having a panic attack), but for the most part, all the others seem to be either Adaptation (appropriately enough) or Alternate Universe.
- Hamilton is generally an example of the Adaptation hypothesis: almost all of the songs involve two or more characters communicating directly, and the songs are clearly not rehearsed in-universe, and the whole musical is told in a modern-day style clearly intended to merely represent what was actually said rather than depict it faithfully. However, it also nods to the Alternate Universe hypothesis in that the characters do occasionally refer to the fact that they are singing (or, more often, rapping): in Aaron Burr, Sir, the revolutionaries press Burr to 'spit a verse, drop some knowledge', and in Farmer Refuted Hamilton riposites 'Don't modulate the key then not debate with me!' (Of course, freestyle rapping is much more a real thing than freestyle singing, but it's hard to think of any setting in which cabinet debates are settled via rap as anything other than an alternate universe.) However, some songs are clearly all in the character's heads, such as Helpless or Hurricane. Also, some songs flip between different hypotheses: The Room Where It Happens starts with a straightforward conversation between Hamilton and Burr, then segues into a more narrative song as the characters explain that nobody really knows what happened in the room complete with demonstrations of what might have gone down, and ends with Burr soliloquising about his own motivations in his head.
- The Sound of Music follows the Diegetic Hypothesis for most of its songs, most notably the title song, "Edelweiss", "My Favorite Things", "The Lonely Goatherd", and the seemingly improvised "Do-Re-Mi". Some of the others seem to follow the Adaptation Hypothesis, such as "Maria" and the Love Themes. (In the movie, Liesel sings "Sixteen Going On Seventeen" with Rolf before Maria teaches the Von Trapp children how to sing.)
- The Wiz seems to follow the Alternate Universe hypothesis for most of the play's numbers. In the screen versions, "You Can't Win" (which didn't appear in the original Broadway production) provides a Diegetic example, while songs that Dorothy sings when she has the set all to herself appear staged in a way that suggest that they occur All In Her Head. The movie also uses "The Feeling That We Have" as a Diegetic example.
- The Drowsy Chaperone plays with this.
- The Show Within a Show The Drowsy Chaperone is mostly Alternate Universe, as almost every number is followed by a comment on it:
- George says it's too dangerous for Robert to be tap dancing after the tap number "Cold Feet".
- Kitty says she's surprised Janet didn't do an encore after "Show-Off", which is immediately followed by "Show Off - Reprise".
- Janet and the Chaperone seem to be impatiently waiting for the end of "As We Stumble Along" and "I Am Adoplho", respectively. The former just wants some real advice instead of having to listen to the Chaperone sing about her alcoholism, and the latter just wants to have sex with Adolpho instead of being subjected to his "I Am Great!" Song.
- Janet questions why they're so happily dancing to the upbeat-yet-life-ruining "Toledo Surprise", and Robert responds that the tune is too infectious to resist. The song itself begins as Feldzieg teaches the Gangsters how to dance.
- Underling fetches himself a glass of "ice water" after the softshoe portion of "Love is Always Lovely in the End".
- However, the number "Bride's Lament" is entirely within Janet's head, as the Man in the Chair even points out when she begins to go into "a complete mental breakdown" when the song ramps up and the monkeys appear.
- Furthermore, the entire show, as we see it, is in the Man in the Chair's head: he's listening to the cast album of the show The Drowsy Chaperone, and imagining it as it happens. At times he even joins in in certain numbers and pauses, skips, or rewinds certain scenes, none of which the "characters" notice. When his Super shows up, he doesn't seem to notice the plane onstage.
- The finale, "As We Stumble Along (Reprise)", is entirely in the Man in the Chair's head and features a strange portmanteau of the characters and their actors - Tottendale, for example, who was played in-universe by a woman named Ukulele Lil, begins the song by playing the ukulele to accompany the Man in the Chair's singing.
- The Show Within a Show The Drowsy Chaperone is mostly Alternate Universe, as almost every number is followed by a comment on it:
- Epic Mickey 2: The Power of Two is most likely Alternate Universe... mostly only for one character. The Mad Doctor is the only character who sings, and the other characters react to it as if it's unusual. However, some other characters join in without any sort of reaction during "Fall of Prescott".
- Dr. Horrible's Sing-Along Blog seems to largely use the Alternate Universe Hypothesis plus All In Their Heads, but still a bit of the Adaptation Hypothesis:
- Judging from the half-embarrassed way in which Billy stops singing when Moist enters, Freeze Ray seems to imply he really is singing, hence Alternate Universe, though the laundromat scenes are of course All In His Head.
- Although it's possible that the part of the song where he sings to Penny and she responds is flashback to something that really happened - he was going through the song in his head but then accidentally sang a line out loud. It never really clarifies what happened there.
- Both versions of the Bad Horse Chorus are Adaptation Hypothesis: Billy actually is reading the letter, but the singing cowboys are an artistic touch to make the reading of the letter more fun.
- Brand New Day and Everything You Ever are All In Billy's Head, inner monologues that are clearly not heard by the other characters around in the scene.
- My Eyes is an All In Their Heads duet, with no other characters present in the scenes being aware of either Billy or Penny's singing.
- Other songs feature interruptions and other indicators that they are happening in-universe; others are ambiguous but judging from the rest can probably be taken to be Alternate Universe.
- There's a music number about it in LoadingReadyRun appropriately named "Suspend Your Disbelief".
- Discussed in Cracked's 5 Videos That Will Brighten Your Day. It describes the video "College of DuPage Flash Mob Dance and Pep Rally", in which a Flash Mob of a half dozen people perform rehearsed dance moves, and then someone outside the group spontaneously joins in the dance fever. The author jokes that the outsider is attempting to fit into an Alternate Universe: "Oh, life is a musical now? OK, I'd better adapt!"
- Also discussed in the video "The Horrifying Truth About Life Inside Movie Musicals", where they suggest telepathy, puppeteers, slavery, fascism, mental illness, and the idea of singing and dancing providing a drug-like high as in-universe reasons why everybody sings in musicals.
- "Zanzibar", the Musical Episode from Rocko's Modern Life, used the Diegetic Hypothesis, where it turns out everyone had actually gone to rehearsals in preparation... everyone except Rocko, who missed the fliers announcing the upcoming musical, and so tends to flounder whenever he tries to sing.
Rocko: Uh...this was sort a...spur-of-the-moment, spontaneous thing.Security Guard: Uh-huh. And how do y'all know the words?"Heffer: ...Ooh boy, he's got ya there, Rock.Rocko: I don't know the words!Everyone: (singing) He doesn't know the words!Rocko: SHUT UP!
- Although weirdly, while the songs were supposed to be rehearsed beforehand, most of the events that they're singing about are supposed to be happening naturally. Lampshaded:
- The Simpsons tends to fall into the Alternate Universe Hypothesis, since when a musical number turns up, there will often be lines like this one:
Homer: He lied to us through song! I hate that.
- The episode "Mayhem of the Music Meister!" of Batman: The Brave and the Bold is the "Alternate Universe with magic" type, as the villain's hypnotic voice caused people to sing and dance under his control. (How everyone knew what they had to sing and do is not explained however. Though the Meister's songs don't have to specify the actual commands (he doesn't say anything like "Attack Batman" during Drives Us Bats, but they do anyway), so he probably mindcontrolled them into knowing the lyrics.)
- It's also slightly diagetic- the Music Meister didn't seem to have anything to do with "If Only".
- And it's actually Lampshaded by Batman after Death Trap, which Black Canary sang after Music Meister had already left the room.
- Batman: Was the singing really neccessary?
- It seems that every animated series finds a way to give Joker a musical number. All of them Diegetic, in character, and fit in-scene.
- BTAS - Jingle Bells Batman Smells
- The Batman - Setting the Woods on Fine
- Batman Brave and the Bold - Where's the Fun in That
- The Veggie Tales: Jonah movie plays with this trope. Jonah's musical number inside the whale seems to be Adaption Hypothesis, but apparently the singing and music are actually taking place as there is a cut to confused fishermen who can vaguely hear the noise coming from underwater, which would make it Alternate World instead.
- Phineas and Ferb is definitely a musical world, although an...interesting one. While people do burst into song and dance at random times, Doofenshmirtz has been known to hire back-up singers specifically for this purpose. Also, the Musical Episode lampshades it to hell and back.
Phineas: Why don't we burst into spontaneous singing and dancing with no discernible music source?
- Also, they appear to be able to hear the soundtrack- and their singers. They have, in fact, had arguments with them.
- Typically, the songs in Phineas and Ferb can be divided into one of three categories: "soundtrack" songs (All In Their Head) which aren't sung by the characters (such as "Aerial Area Rug"), "prepared" songs (Diegetic) which are specifically shown to have been written and choreographed beforehand (such as "Gitchie Gitchie Goo"), and "spontaneous" songs (Alternate Universe) which come out of nowhere (such as "Blueprints"). One episode states that Danville is well known for its spontaneous musical numbers, indicating that the third category is considered commonplace.
- Like The Simpsons, South Park (especially The Movie) falls into the Alternate Universe Hypothesis, as the boys are quite aware that they're bursting into song and treat it like a perfectly normal thing to do. This made "Elementary School Musical" extremely odd, as Stan, Kyle, Cartman and Kenny find themselves rejected by All of the Other Reindeer because they won't sing: however, Word of God says that while they're comfortable with Broadway-style showtunes, they can't bring themselves to sing High School Musical-style songs because they suck. There also seem to be further "rules" in place about when singing is and isn't acceptable, as the boys found it weird and didn't join in when the Canadians were all singing in "It's Christmas in Canada".
- Total Drama World Tour is mostly Digetic (except for the part where they plan songs out in advance); but the visuals, such as a cut to Team Amazon playing in a real band or both teams dancing in jumpsuits, are Adaptions even when they're signing the song in real time.
- One could argue that it's a weird mixture of Digetic and Alternate Universe: this is not a world where breaking into song is normal, and the characters explicitly do not prepare in advance or know what their songs will be about. Nevertheless when Chris ordains it, music comes out of nowhere and the characters are able to spontaneously sing and dance with only an occasional broken rhyme or confused look.
- In all the Rugrats movies, only the babies, Angelica and Susie break out into musical numbers for no real reason, while adults only sing when they have a reason (trying to sing a baby to sleep, it's part of their job, etc.). Dr. Lipschitz has a song in the extended cut of The Rugrats Movie, but it's in a dream sequence, and Nigel Thornberry has a Cut Song in Rugrats Go Wild!, though he had amnesia and thought he was a baby at the time.
- My Little Pony: Friendship Is Magic makes use of all four variations, with the most common being Diegetic and Alternative Universe. This is lampshaded somewhat regularly, with characters calling back to previous songs or noting how odd it is that that they burst into song so often. A general rule of thumb is any songs done by Pinkie Pie are usually the former (she's shown preparing/rehearsing on several occasions, and one episode even has "sing random song" as part of a mental checklist), while most other solo songs and all whole cast numbers are the latter. Some fans believe that every song in the series could be Diagetic though, with ponies simply having an innate ability to sing songs together without preparation and rehearsal.
- "This Day Aria", meanwhile, is a Distant Duet, which seems impossible to explain without resorting to the Adaptational view, and many songs (such as "True True Friend") flow across several scenes which could not possibly be taking place at the speed of the song.
- Rarity also got a song in "Suited For Success" called "Art Of The Dress", though that could be considered her just singing while she works. The reprise is at least partially in Rarity's head, since it contains a part where the others complain about their own behavior towards her: "All we ever want is indecision/All we ever like is what we know..."
- "The Pony Pokey" from "The Best Night Ever" is weird even for Pinkie, as she somehow knows about all the issues the other Mane Six are having, after they split up upon arrival at the gala. It is technically a Diegetic song, as it is performed by Pinkie Pie to the Ponies at the Great Galloping Gala. However it is also Suspiciously Apropos Music, as its content mirrors the issues of the rest of the Mane Six, although they split up upon arrival and Pinkie shouldn't know what they're currently doing.
- Futurama tends to fall into the Alternate Universe version (with the exception of "Don't Worry, Bee Happy", which was explicitly all in Leela's head). Someone in the song will generally lampshade the fact that they're all singing:
Professor: I can't believe the Devil, is so unforgiving!
Zoidberg: I can't believe that everyone is just ad-libbing!
- And in one episode where Zoidberg has a musical number, Amy is deeply annoyed by the fact that Zoidberg is harmonizing with himself. No one else seems bothered by it, though.
- The Lorax is clearly and unambiguously the Alternate Universe type.
- One episode of The Penguins of Madagascar, "The Return of the Revenge of Doctor Blowhole" is an example of the Alternate Universe type where the world is normally a non-musical one, but a mind-controlling device (a monstrous MP3 player) makes everyone sing. Every character finds it odd, and there's a constant Lampshade Hanging.
- Over the Garden Wall uses the Alternate Universe version, as the main characters are Trapped in Another World called Unknown. Once, when Wirt is compelled to sing about himself, the result comes out as awkward and stilted as you'd expect something made up on the spot. For some reason, Greg doesn't have that problem, though. It's also possible that at least some of these songs might be Diegetic to the people of Unknown, especially since most of them are based on Real Life folk songs.
- Steven Universe is always Alternate Universe, with characters listening to each other sing or the behavior being otherwise acknowledged in-universe. While there are a few exceptions, with some being ambiguous All In Their Head ("Strong in the Real Way", "Stronger Than You", "Full Disclosure") or Adaptation ("Giant Woman", "Both of You"), all of these songs still have a diegetic switch partway through. All these musical numbers have been lampshaded on two separate occasions, with Lars complaining that Steven was just singing while they were doing all the actual work in one episode, and Peridot shares a data log where she noted that Pearl is prone to "random outbursts of singing, crying, singing while crying..." in another.
- Jem is mostly diegetic as the series is about musicians. Most "music videos" are both adaptations of what characters are feeling but also are music that the characters release in-series.
- Adventure Time puts a Reality Ensues twist on the Alternate Universe version by having many musical numbers be very obviously unrehearsed with terrible melodies and worse lyrics. The only exceptions are a handful of characters like Marceline for whom musical talent is part of their personalities.
- In The Fairly Oddparents special School's Out! The Musical, Wanda's and Cosmo's "Floating With You" is definitely diegetic, since they used it in-universe to distract Jorgen. The rest all seem to fit the Adaptation Hypothesis, with each number serving as a condensed way of portraying events that happened and decisions characters made.